Transbrake Setup and Usage

Everything from the motor to the wheels

Moderator: John_Heard

Post Reply
Message
Author
User avatar
71 Nova
Posts: 257
Joined: Thu Dec 14, 2006 10:07 pm
Location: Santa Maria, CA

Transbrake Setup and Usage

#1 Post by 71 Nova » Mon Jul 26, 2010 9:25 pm

My new Camaro has a TH400 with a transbrake, and a MSD 7AL with just a top end rev limiter. I’ve never set up or driven a car with a transbrake, so I have a few questions. :?

What does a typical transbrake/rev limiter setup consist of? Do you just activate the brake, stall the converter at full throttle then release the brake to launch? Or should the engine have a rev limiter at some intermediate RPM (below converter stall speed) that is deactivated when the brake is released? Or ??? :scratch:
Last edited by 71 Nova on Tue Jul 27, 2010 8:32 pm, edited 1 time in total.
69 Nova 408 SBC
Best to date: 10.241 @ 128.36 mph 1.404 60ft.

User avatar
vegaracer
Posts: 676
Joined: Mon Aug 20, 2007 1:12 pm
Location: Wyoming, Ontario, CANADA

Re: Transbrake Steup and Usage

#2 Post by vegaracer » Mon Jul 26, 2010 10:04 pm

Normally, theres an intermediate RPM you hold it at. On the 7AL, you plug in a two or three step module into where your rev limit chip is now. When you press you transbrake button, it activates the two-step to hold the motor at the intermediate RPM and your transbrake. When you release the button, all hell brakes loose. 3rdgear:
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Re: Transbrake Steup and Usage

#3 Post by BracketNova » Mon Jul 26, 2010 10:23 pm

Ditto. If you really wanna get tricky(like me) you can add a delay box. Same as above only you react to the top bulb, let go of the button, it runs through the box -nothing happens for a second or so, THEN all hell brakes loose.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

User avatar
chpcamaro
Posts: 773
Joined: Sun Nov 09, 2008 1:28 am
Location: socali

Re: Transbrake Steup and Usage

#4 Post by chpcamaro » Mon Jul 26, 2010 11:08 pm

is this a 7al2 or 7al3 box
best to date N/A 8.91@153
psca westcoast heads up racing open comp
67 Camaro RS/SS
BBC Powerglide 4800 stall 4.11 29.5x10.5W
http://www.chpdragracing.com

User avatar
71 Nova
Posts: 257
Joined: Thu Dec 14, 2006 10:07 pm
Location: Santa Maria, CA

Re: Transbrake Steup and Usage

#5 Post by 71 Nova » Tue Jul 27, 2010 8:17 pm

chpcamaro wrote:is this a 7al2 or 7al3 box
It's a 7AL-2, MSD PN 7220.

---------------------------------
Thanks for the info guys...
Ken
Last edited by 71 Nova on Tue Jul 27, 2010 8:33 pm, edited 1 time in total.
69 Nova 408 SBC
Best to date: 10.241 @ 128.36 mph 1.404 60ft.

User avatar
Carolina Kid
Posts: 254
Joined: Sat Jul 26, 2008 10:56 am

Re: Transbrake Steup and Usage

#6 Post by Carolina Kid » Tue Jul 27, 2010 8:30 pm

I would think that your car would already have a two-step box on it.
look around real good.

User avatar
71 Nova
Posts: 257
Joined: Thu Dec 14, 2006 10:07 pm
Location: Santa Maria, CA

Re: Transbrake Steup and Usage

#7 Post by 71 Nova » Wed Jul 28, 2010 9:26 am

Carolina Kid wrote:I would think that your car would already have a two-step box on it.
look around real good.
I searched high and low. No two-step... :(
69 Nova 408 SBC
Best to date: 10.241 @ 128.36 mph 1.404 60ft.

User avatar
vegaracer
Posts: 676
Joined: Mon Aug 20, 2007 1:12 pm
Location: Wyoming, Ontario, CANADA

Re: Transbrake Setup and Usage

#8 Post by vegaracer » Wed Jul 28, 2010 11:57 am

Whats the red box on the dash of the car? It looks like it says something retard on it, and has spots for three chips, but only has one in it.
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

User avatar
CDR Performance
Posts: 147
Joined: Tue Mar 02, 2010 7:41 pm
Location: Indianapolis, Indiana

Re: Transbrake Setup and Usage

#9 Post by CDR Performance » Wed Jul 28, 2010 1:20 pm

Who's transmission is in the car? Coan, TCI, .....
And did you get any info on the valve body?
Some Manual V/B require you to press the Transbrake button in reverse. It may going into reverse but will not last long.
The transbrake is like side stepping the clutch in a stick car. You should be able to get to XXXX rpm base on the convertor and then release the button make a quicker reaction time.


Check the link for info on the box.
18 pages
http://www.msdignition.com/instructions ... s/7220.pdf
CDR PERFORMANCE
The Custom Engine Shop

Dart - Callies - BRC - Oliver - BME - Custom Cams - T&D - Trend - JGS - BorgWarner - SuperNatural - EV - CSU - C&S - BS3

http://www.cdrperformance.biz

User avatar
71 Nova
Posts: 257
Joined: Thu Dec 14, 2006 10:07 pm
Location: Santa Maria, CA

Re: Transbrake Setup and Usage

#10 Post by 71 Nova » Wed Jul 28, 2010 1:57 pm

vegaracer wrote:Whats the red box on the dash of the car? It looks like it says something retard on it, and has spots for three chips, but only has one in it.
The red box is the nitrous retard (MSD PN 8972). Only one N2O retard chip installed now.
CDR Performance wrote:Who's transmission is in the car? Coan, TCI, .....
And did you get any info on the valve body?
Some Manual V/B require you to press the Transbrake button in reverse. It may going into reverse but will not last long.
The transbrake is like side stepping the clutch in a stick car. You should be able to get to XXXX rpm base on the convertor and then release the button make a quicker reaction time.
[/url]
It is a TCI TH400 with a reverse pattern manual transbrake valve body. I got some info with the car that I need to look thru. Thanks!
69 Nova 408 SBC
Best to date: 10.241 @ 128.36 mph 1.404 60ft.

Post Reply

Who is online

Users browsing this forum: No registered users and 14 guests